// The MIT License
//
// Copyright (c) 2016 Dariusz Bukowski
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#import <Foundation/Foundation.h>
#import <DBTitleValueTableViewCellDataSource.h>

/**
 A protocol used for providing data that needs to be presented in the `DBTitleValueListTableViewController` instance. It is also responsible for handling user interaction.
 */
@protocol DBTitleValueListViewModel

/**
 Returns the number of title-value pairs.
 */
- (NSInteger)numberOfItems;

/**
 Returns a `NSString` instance that will be used as a title for `DBTitleValueListTableViewController` instance.
 */
- (NSString *)viewTitle;

/**
 Provides the data source object for a cell at the given index.
 
 @param index The index of the cell that needs the data source.
 */
- (DBTitleValueTableViewCellDataSource *)dataSourceForItemAtIndex:(NSInteger)index;

/**
 Handles tap on the clear button on the navigation bar.
 */
- (void)handleClearAction;

/**
 Handles delete action on the cell at the given index.
 
 @param index The index of the cell that user chose to delete.
 */
- (void)handleDeleteItemActionAtIndex:(NSInteger)index;

/**
 Returns a `NSString` instance that will be used as a text in the background label of the table view.
 */
- (NSString *)emptyListDescriptionString;

@end
